import numpy as np
import random
import time
import string
from numpy import random
def data():
    a = random.randint(2000, size=(100))
    b = random.randint(2000, size=(500))
    c = random.randint(2000, size=(900))
    d = random.randint(2000, size=(1300))
    return [a,b,c,d]